Liquid crystal displays

A technology of liquid crystal display device and liquid crystal layer, which is applied in optics, instruments, nonlinear optics, etc., and can solve problems such as inability to be compensated

Inactive Publication Date: 2009-01-14
INNOLUX CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(a) Since each circular polarizing plate uses a monochromatic quarter-wave plate and a linear polarizing plate, and the two A plates located on each side and sandwiched between the polarizing plate and the quarter-wave plate, only It is used to compensate the light leaked by the two linear polarizers in the off-axis direction, which is different from the function of the broad frequency band of the half-wave plate; (b) in the reflective mode, the light passes through the liquid crystal cell twice at the same top , each time can be regarded as a quarter-wave plate of the same type (both times are positive type, such as Figure 2B shown), therefore, the reflected light cannot be compensated after passing through the same type of quarter-wave plate

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0079] Please refer to Figure 3A , which is a cross-sectional view of the wide viewing angle and broadband circular polarizing plate of the first embodiment, and is constructed in a transflective LCD or used in a pure transmissive LCD. A liquid crystal layer 150, such as a vertically aligned liquid crystal cell, is sandwiched between a first glass substrate 155a and a second glass substrate 155b, wherein a thin film transistor (Thin Film Transistor, TFT) array is for example described in the following US Among the patents: U.S. Patents. 5,528,055 to Komori; 6,424,396 to Kim et al.; and 6,760,087. Each of the aforementioned patents is incorporated by reference. A TFT array can be formed on the bottom substrate 155a to provide driving voltage to regulate the liquid crystal layer therebetween.

[0080] Two stacked broadband circular polarizers 130a and 130b are placed between the liquid crystal layer and the two glass substrates, wherein the two circular polarizers compensate ...

no. 2 example

[0108] Please refer to Figure 9A , which shows a structural diagram of a second embodiment of the present invention. corresponds to Figure 3A The architecture, where each plate A is set to have opposite birefringence. The liquid crystal unit 250 is interposed between a first glass substrate 255a and a second glass substrate 255b, wherein a TFT array (not shown in Figure 9A ) can be formed on the bottom substrate 255a to provide a driving voltage to regulate the liquid crystal layer therebetween. Two stacked circular polarizing plates 230a and 230b are placed between the liquid crystal layer and the two glass substrates. The first circular polarizing plate 230a also includes a first linear polarizing plate 200a, a first half-wave plate 210a and a first quarter-wave plate 220a, and the second circular polarizing plate 230b also includes a second linear polarizing plate 200b , a second half-wave plate 210b and a second quarter-wave plate 220b. Please refer to Figure 9B ...

no. 3 example

[0113] Please refer to Figure 12A , which is a structural diagram of a third embodiment of the present invention. In addition, in the structure of circular polarizing plates suitable for wide viewing angles and wide frequency bands of transflective LCDs proposed in this example, although the half-wave plates and quarter-wave plates of each circular polarizing plate have the same type ( For example: both are positive A-plates or negative-type plates), but the half-wave plates or quarter-wave plates corresponding to different circular polarizing plates have opposite types. At Figure 12A Among them, the first circular polarizing plate 330a with broadband and wide viewing angle characteristics is formed by a first linear polarizing plate 300a, a first half-wave plate 310a, and a first quarter-wave plate 320a. The half-wave plates and quarter-wave plates of the first circular polarizing plate are made of positive type A plates, wherein the transmission axis 301a of the first li...

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Abstract

Apparatus, devices, systems, and methods for wide viewing angle and broadband circular polarizers in transflective displays. A liquid crystal display configuration can include two stacked circular polarizers, each having a linear polarizer, a half-wave plate and a quarter-wave plate wherein two linear polarizers are crossed to each other, two half-wave plates are made of uniaxial A plates with opposite optical birefringence (one positive and one negative type), and two quarter-wave plates are made of uniaxial A plates with opposite optical birefringence (one positive and one negative type). The configurations can generate wide viewing angles and broadband properties and are suitable for display applications that require circular polarizers.

Description

technical field [0001] The present invention relates to a liquid crystal display device, in particular to a transflective display using a circular polarizing plate, and in particular to a circular polarization that can be used in a transflective display with a wide viewing angle and a wide frequency band Apparatus, apparatus, systems and methods for panels. Background technique [0002] A transflective liquid crystal display (LCD) usually relies on a circular polarizing plate to transmit light. Transflective liquid crystal displays are widely used in various portable devices due to their high image quality and excellent sunlight readability. Generally speaking, in a transflective LCD device, each pixel is divided into a transmissive region (T) and a reflective region (R). The reflective region R uses a broadband circular polarizer to achieve the preferred dark state. To provide a normally dark state in reflective mode, the transmissive region T of the liquid crystal cell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/1362G02B5/30
CPCG02F2413/14G02F2413/08G02F2001/133541G02F1/13363G02F2413/13G02F2203/09G02F2413/04G02F2001/133638G02F1/133541G02F1/133638
Inventor 葛志兵焦美子吕瑞波武新章吴诗聪李汪洋韦忠光
Owner INNOLUX CORP
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